The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-009-7616, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Capy Machine Shop Inc. Dba Capy Machine Shop Inc. Government technical data includes 23 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-009-7616 |
| Primary Part Number | A51G20538-11 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Capy Machine Shop Inc. Dba Capy Machine Shop Inc |
| Status | ACTIVE |
| Head Height | 0.125 INCHES NOMINAL IN |
| Fastener Length | 3.324 INCHES MINIMUM AND 3.329 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-C-320 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Concentric Hole Depth | 2.860 INCHES NOMINAL IN |
| Thread Length | 0.339 INCHES MAXIMUM IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.075 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE IN |
| Style Designator | CONCENTRIC HOLE UNTHREADED |
| Material Document and Classification | G-1010 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | ROUND W/WRENCH FLATS CHAMFERED |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.688 INCHES NOMINAL IN |
| Shoulder Diameter | 0.4965 INCHES MINIMUM AND 0.4985 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.339 INCHES MINIMUM AND 0.349 INCHES MAXIMUM IN |
| Surface Treatment | CHROMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Shoulder Length | 2.985 INCHES MINIMUM AND 2.990 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 3.184 INCHES MINIMUM AND 3.189 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.875 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A51G20538-11 | Capy Machine Shop Inc. Dba Capy Machine Shop Inc (USA) |
| A51G20538-11 | Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp (USA) |
| Reference | Meaning |
|---|---|
| A51G20538-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51G20538-11 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| A51G20538-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 5306-00-009-7616 is a Bolt,internally Relieved Body, manufactured by Capy Machine Shop Inc. Dba Capy Machine Shop Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-009-7616 has 2 manufacturer part numbers on file: A51G20538-11 (Capy Machine Shop Inc. Dba Capy Machine Shop Inc), A51G20538-11 (Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp).
Key specifications for A51G20538-11: Head Height: 0.125 INCHES NOMINAL IN; Fastener Length: 3.324 INCHES MINIMUM AND 3.329 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-C-320 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Concentric Hole Depth: 2.860 INCHES NOMINAL IN. 23 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.